http://zyan.cc/index.php zh-cn http://zyan.cc/post/307/ 张宴 <net@s135.com> Thu, 01 Nov 2007 14:29:17 +0000 http://zyan.cc/post/307/ DNS轮循
　　DNS轮循是指将相同的域名解释到不同的IP，随机使用其中某台主机的技术。但其具有明显的缺点：一旦某个服务器出现故障，即使及时修改了DNS设置，还是要等待足够的时间（刷新时间）才能发挥作用，在此期间，保存了故障服务器地址的客户计算机将不能正常访问服务器。DNS负载均衡采用的是简单的轮循负载算法，不能区分服务器的差异，不能反映服务器的当前运行状态，不能做到为性能较好的服务器多分配请求，甚至会出现客户请求集中在某一台服务器上的情况。

　　F5 BIG-IP
　　简介：F5 Networks 公司的著名硬件负载均衡交换机。支持硬件四层、七层交换。不同的型号性能不同，BIG-IP 6400可以支持800万条并发连接，低一点型号的可以支持400万条以上的并发连接。性能极高，但价格也不菲。
　　价格：BIG-IP 6400的价格在16万元人民币左右。
　　网址：http://www.f5.com.cn/（中国） http://www.f5.com/（全球）

　　LVS（Linux Virtual Server）
　　简介：软件四层交换。LVS是在Linux内核中作四层交换，只花128个字节记录一个连接信息，不涉及到文件句柄操作，故没有65535最大文件句柄数的限制。LVS性能很高，可以支持100～400万条并发连接。
　　价格：免费、开源
　　网址：http://zh.linuxvirtualserver.org/

　　L7SW（Layer7 switching）
　　简介：软件七层交换。这是一款类似LVS的新负载均衡软件，我没有实际应用过，性能未知，因此不作评价。这是它的英文介绍：Layer7 switching is driving a low-level engine using networking design to speed-up forwarding of data stream. Implementation in this project is split into a userspace daemon and a low-level kernelspace forwarding engine. Userspace daemon is responsible for scheduling and switching decisions. Kernelspace forwarding engine is responsible for forwarding stream and using TCP-Splicing scheme. TCP-Splicing is the postponement of the connection between the client and the server in order to obtain sufficient information to make a routing decision. This project is close to Linux Virtual Server project since lot of discusions on this topics have been made online and offline LVS project.
　　价格：免费、开源
　　网址：http://www.linux-l7sw.org/

　　HAProxy
　　简介：软件七层交换，反向代理服务器。目前还不支持虚拟主机，但其配置简单，拥有非常不错的服务器健康检查功能，当其代理的后端服务器出现故障，HAProxy会自动将该服务器摘除，故障恢复后再自动将该服务器加入。另外，HAProxy还支持双机热备。我曾经用过一段时间，能支持2～3万条并发连接。现在我用它做普通的小并发负载均衡，主要用到的是它的服务器健康检查功能。
　　价格：免费、开源
　　网址：http://haproxy.1wt.eu/

　　Nginx
　　简介：软件七层交换，反向代理服务器。能够很好地支持虚拟主机，可配置性很强，可以按URL做负载均衡。我目前一直在用，大约能支持3～5万条并发连接。
　　价格：免费、开源
　　网址：http://wiki.codemongers.com/NginxChs（中文维基）
Tags - linux , 负载均衡 ]]> http://zyan.cc/post/307/#blogcomment439 Hugo.Leens 生活流水账 <user@domain.com> Fri, 02 Nov 2007 14:46:31 +0000 http://zyan.cc/post/307/#blogcomment439 http://zyan.cc/post/307/#blogcomment445 mysuso <user@domain.com> Mon, 05 Nov 2007 02:08:45 +0000 http://zyan.cc/post/307/#blogcomment445 http://zyan.cc/post/307/#blogcomment447 outrace <user@domain.com> Tue, 06 Nov 2007 11:02:05 +0000 http://zyan.cc/post/307/#blogcomment447 因为目前haproxy更新很快。

另外请问一下，lvs的测试数据，是使用lvs文档中介绍的3种IP负载均衡中的那种方式的测试结果
nat ? / ip tun ? / dr
另外我看lvs提供下载的源代码都好老了。不太放心哦。

最近正在学习这些。还请楼主赐教。 ]]> http://zyan.cc/post/307/#blogcomment454 jackbillow <jackbillow@gmail.com> Wed, 14 Nov 2007 07:13:21 +0000 http://zyan.cc/post/307/#blogcomment454 http://zyan.cc/post/307/#blogcomment455 jackbillow <jackbillow@gmail.com> Wed, 14 Nov 2007 07:26:47 +0000 http://zyan.cc/post/307/#blogcomment455 http://zyan.cc/post/307/#blogcomment1472 huicong7788 <zhxsh@vip.qq.com> Mon, 01 Sep 2008 08:56:35 +0000 http://zyan.cc/post/307/#blogcomment1472 http://zyan.cc/post/307/#blogcomment2591 xxdtpyy <xxdtpyy@tom.com> Tue, 17 Feb 2009 11:52:10 +0000 http://zyan.cc/post/307/#blogcomment2591         如果有时间的话，能否请教一个haproxy相关的问题？我现在测试用的版本是1.3.15.6的，配置文件如下：

maxconn 5120
#       log 192.168.10.180 local3 info
       log 127.0.0.1   local1 notice
       uid 501
       gid 502
       daemon
       quiet
       nbproc  2  
       pidfile /var/run/haproxy-private.pid
defaults
       mode    http
       option  httplog
       option  dontlognull
#       log 127.0.0.1 local3
       retries 3
       redispatch
       maxconn 2000
       contimeout      5000
       clitimeout      50000
       srvtimeout      50000

listen webfarm  192.168.10.180:80
      mode http
      stats enable
      balance  uri    
#      dispatch 192.168.10.180:80
#      cookie SERVERID insert indirect
      log global
      option httplog
      option logasap
      option forwardfor  
server web181 192.168.10.181:80 cookie app1inst1 check inter 2000 rise 2 fall 5
server web182 192.168.10.182:80 cookie app1inst2 check inter 2000 rise 2 fall 5
工作正常，能够根据URL的不同，而转发到不同的后台服务器上，但是就是不记录日志。
如果加-d参数启动haproxy的话，在前段是有信息的，但是就是不记录日志，至于网上流传的：
syslog.conf里加一行
local3.*         /var/log/haproxy.log
# touch /var/log/haproxy.log
# chown haproxy:haproxy /var/log/haproxy.log
# chmod u+x /var/log/haproxy.log
也都试过，可是/var/log/haproxy.log就是不记录日志，不知道为什么？
楼主能否指点一下?非常感谢！
xxdtpyy@tom.com ]]> http://zyan.cc/post/307/#blogcomment3065 Max <user@domain.com> Mon, 20 Apr 2009 13:22:41 +0000 http://zyan.cc/post/307/#blogcomment3065 http://zyan.cc/post/307/#blogcomment6202 higkoo <higkoo@tom.com> Mon, 21 Jun 2010 15:31:13 +0000 http://zyan.cc/post/307/#blogcomment6202
我在使用LVS的时候并没有如上介绍那么好的性能，而且很不理想。

我把整个调优过程都记录下来了，希望您有空帮小弟指点迷津：

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